[Bug-wget] "-c" + "no newer" + "sizes do not match" = "No such file" (bug?)

[Pierre Fortin]

Hi,

I use wget to mirror most (except test, debug, and many foreign language
files) of the Mageia Linux distro.  After killing a session midstream, I
added "-c" to resume a large file, then just left it in the command:

$ wget -c --config=/home/pfortin/.wgetrc.getMageia --no-host-directories
ftp://mirror.nexcess.net/mageia/distrib/cauldron/x86_64/

This seemed to work; then I noticed that a small number of files were
"missing" (No such file).

In the below snippet, the .listing file contains:
     -rw-r--r-- 1 ftp     ftp      78146 Jan 13 16:52 01_IM_mageia.png
while the local directory has:
     -rw-r--r-- 1 pfortin pfortin 139343 Jan 13 16:52 01_IM_mageia.png

Re-issuing the above command without -c downloaded the files correctly.

Thinking about this a tad more, could it be that the initial use of -c
caused some files to be added to (can't think of any reason why image
files would grow otherwise)? Then, subsequent gets triggered this bug
due to size mismatch caused by the initial faulty [re-]get?

===================== snippet ==========================
==> CWD (1) /mageia/distrib/cauldron/x86_64/install/extra/advertising ...
done. ==> PASV ... done.    ==> LIST ... done.

    [ <=>
    ] 1,628       --.-K/s   in 0.006s  

2014-01-14 10:36:02 (265 KB/s) - ‘install/extra/advertising/.listing’
saved [1628]

Remote file no newer than local file
‘install/extra/advertising/01_IM_mageia.pl’ -- not retrieving. The sizes
do not match (local 139343) -- retrieving.

--2014-01-14 10:36:02--
ftp://mirror.nexcess.net/mageia/distrib/cauldron/x86_64/install/extra/advertising/01_IM_mageia.png
=> ‘install/extra/advertising/01_IM_mageia.png’ ==> CWD not required.
==> PASV ... done.    ==> REST 139343 ... done.    
==> RETR 01_IM_mageia.png ... 
No such file ‘01_IM_mageia.png’.
=========================================================

Hope this helps track down how this happened...
Pierre